Disc unwinding component of printing machine
By employing a symmetrical double-disc structure with positioning bearings for limiting and a top-loading mechanism, the design solves the problems of rotational instability and large rotational error in traditional printing presses with a central shaft placement, as well as large rotational error and offset in offset disc placement. The double-disc structure with positioning bearings for limiting, combined with a reducer drive and a double-top cone clamping and axial adjustment mechanism for the top-loading mechanism, solves the problems of large rotational error and significant offset caused by uneven force in traditional printing presses, achieving precise registration and efficient production in high-speed printing.
Patent Information
- Application Number
- CN202522367031.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-07
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-11-07
AI Technical Summary
Traditional single-center-axis unwinding frames in printing presses suffer from uneven force distribution, resulting in large rotational errors and significant offsets, which affect printing registration accuracy and production efficiency.
The design employs a double-disc symmetrical structure with positioning bearings for limiting, combined with a reducer drive and a double-top cone clamping and axial adjustment of the top material mechanism to ensure stable clamping and precise position adjustment of the unwinding roller.
Significantly reduces rotational errors and offsets, enabling rapid roll changes and precise registration, thereby improving printing quality and production efficiency.
Smart Images
Figure CN223687714U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to printing equipment technical field, concretely relates to a disc unwinding component for unwinding process of printing machine. BACKGROUND
[0002] In the continuous printing process of the printing machine, the printing material (such as paper) is usually placed in the form of a roll on the unwinding frame for unwinding. The traditional unwinding frame adopts a structure design of installing two unwinding rollers on a single central shaft. When the weight of the roll changes rapidly during the unwinding process (for example, during the roll changing operation), the central shaft will have a significant rotation error and offset due to uneven force distribution. With the increase of the printing speed of the printing machine, this unstable rotation state will directly cause the deviation of the printing material conveying position, thereby causing the problem of inaccurate printing registration, which seriously affects the quality and production efficiency of the printed matter. SUMMARY
[0003] In view of the problem of large rotation error and significant offset of the traditional single central shaft unwinding frame caused by uneven force, a disc unwinding component with stable structure, high rotation accuracy and accurate unwinding position adjustment is provided to meet the registration requirements of high-speed printing.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a disc unwinding component of a printing machine, comprising two symmetrically arranged side plates, a turnover assembly and a material lifting and unwinding driving assembly are installed on the two side plates; the turnover assembly comprises a first support installed on one of the side plates, a rotatable central shaft is installed on the first support, and a disc corresponding to the two side plates is symmetrically installed at both ends of the central shaft; a limiting hole matched with the disc is arranged on the side plate, the disc rotates in the limiting hole, a positioning bearing is arranged along the edge of the limiting hole on the side plate, the positioning bearings are symmetrically arranged, and part of the positioning bearings extends into the limiting hole and contacts the outer peripheral wall of the disc; the rotation of the central shaft is driven by a speed reducer; an unwinding roller is symmetrically arranged between the discs along the central shaft, and the unwinding roller is fixed and driven by the material lifting and unwinding driving assembly; the material lifting and unwinding driving assembly comprises a second support fixed on the other side plate, a driving motor corresponding to the unwinding roller and a shaft tube are installed on the second support, a transmission shaft and a transmission coil are installed in the shaft tube, the transmission shaft is connected with the transmission coil through a bearing sleeve, one of the driving motors is connected with the transmission shaft through a first belt for transmission output, the other driving motor is connected with the transmission coil through another first belt for transmission output, and the other ends of the transmission shaft and the transmission coil are respectively connected with the corresponding unwinding rollers through second belts for transmission connection; the second belts are connected with the unwinding rollers through a material lifting mechanism for transmission.
[0005] The top material mechanism comprises a left top cone assembly and a right top cone assembly, and the left top cone assembly and the right top cone assembly each comprise a mounting cylinder mounted on a side plate, a top material shaft, an upper sliding sleeve and a lower rotating sleeve are arranged in the mounting cylinder, one end of the top material shaft is mounted on the upper sliding sleeve through a first bearing, the lower rotating sleeve is connected with the inner wall of the mounting cylinder through a second bearing, a guide sleeve is arranged on the inner wall of the lower rotating sleeve, an axial groove protrusion guide cooperation structure is arranged between the inner wall of the guide sleeve and the outer wall of the top material shaft, the end of the top material shaft extends out of the mounting cylinder and is provided with a top cone, a belt pulley groove is arranged on the outer wall of the lower rotating sleeve of the left top cone assembly, and the left top cone assembly is connected with the second belt through the belt pulley groove, the upper sliding sleeve of the left top cone assembly is connected with the piston rod of a cylinder, and the cylinder drives the upper sliding sleeve to drive the top material shaft to extend out, so that the top cone on the top material shaft clamps the unwinding roller, the upper sliding sleeve of the right top cone assembly is screw-connected with a screw rod, and the screw rod is rotatably mounted on the mounting cylinder, and the rotation of the screw rod is driven by a hand wheel.
[0006] The positioning bearing is four, and is symmetrically arranged on the edge of the limiting hole.
[0007] The beneficial effects of the utility model are: the double-disc symmetric structure cooperates with the positioning bearing limiting, disperses the single-point pressure of the material weight on the central shaft, significantly reduces the rotation error and the offset, the disc overturning function driven by the speed reducer realizes the quick roll changing, the double-top-cone clamping and axial adjustment function of the top material mechanism ensures the stable clamping of the unwinding roller, and the axial position adjustment ensures the printing material conveying precision, effectively solves the overprint deviation problem during high-speed printing, and improves the printing quality and the production efficiency.
[0008] The utility model will be further described in combination with the drawings and the specific embodiment. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is the structure diagram of the specific embodiment of the utility model;
[0010] Figure 2 It is the side view structure diagram of the specific embodiment of the utility model;
[0011] Figure 3 It is the structure diagram of the top material mechanism in the specific embodiment of the utility model.
[0012] Explanation of reference numerals in the attached drawings: 1-Side plate; 2-First bracket; 3-Central shaft; 4-Disc; 5-Limiting hole; 6-Positioning bearing; 7-Reducer; 8-Unwinding roller; 9-Second bracket; 10-Drive motor; 11-Shaft tube; 12-Transmission shaft; 13-First belt; 14-Second belt; 15-Left top cone assembly; 16-Right top cone assembly; 17-Mounting cylinder; 18-Top material shaft; 19-Upper sliding sleeve; 20-Lower rotating sleeve; 21-First bearing; 22-Second bearing; 23-Guide sleeve; 24-Axial groove protrusion; 25-Top cone; 26-Cylinder; 27-Screw; 28-Handwheel; 121-Transmission rotating tube. Detailed Implementation
[0013] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.
[0014] like Figure 1 — Figure 3 As shown, this embodiment discloses a disc unwinding component for a printing press, including two symmetrically arranged side plates 1. A flipping assembly and a top unwinding drive assembly are mounted on each side plate 1. The flipping assembly includes a first bracket 2 mounted on one of the side plates 1, with a rotatable central shaft 3 mounted on the first bracket 2. Discs 4, corresponding one-to-one with the two side plates 1, are symmetrically mounted at both ends of the central shaft 3. The side plate 1 has limiting holes 5 adapted to the discs 4, allowing the discs 4 to rotate within the limiting holes 5. Positioning bearings 6, symmetrically arranged along the edge of the limiting holes 5, are mounted on the side plate 1, with a portion of each bearing extending into the limiting holes 5 and contacting the outer peripheral wall of the disc 4. The rotation of the central shaft 3 is driven by a reducer 7. Unwinding rollers 8, symmetrically arranged along the central shaft 3, are positioned between the discs 4. The unwinding roller 8 is fixed and driven by the top material unwinding drive assembly. The top material unwinding drive assembly includes a second bracket 9 fixed on the other side plate 1. The second bracket 9 is equipped with a drive motor 10 corresponding to the unwinding roller 8 and a shaft tube 11. The shaft tube 11 is equipped with a drive shaft 12 and a drive tube 121. The drive shaft is sleeved with the drive tube 121 through a bearing. The drive tube 121 is connected to the inner wall of the shaft tube 11 through a bearing. One drive motor is driven by the drive shaft 12 through a first belt, and the other drive motor is driven by the drive tube 121 through another first belt. The other ends of the drive shaft 12 and the drive tube 121 are respectively driven by the output of the corresponding unwinding roller through the second belt 14. The second belt 14 is driven by the unwinding roller 8 through the top material mechanism.
[0015] The top mechanism comprises a left top cone assembly 15 and a right top cone assembly 16, each of which comprises a mounting cylinder 17 mounted on the side plate 1, a top material shaft 18, an upper sliding sleeve 19 and a lower rotating sleeve 20 arranged in the mounting cylinder 17, one end of the top material shaft 18 is mounted on the upper sliding sleeve 19 through a first bearing 21, the lower rotating sleeve 20 is connected with the inner wall of the mounting cylinder 17 through a second bearing 22, the inner wall of the lower rotating sleeve 20 is provided with a guide sleeve 23, an axial groove and convex strip guide cooperation structure 24 is arranged between the inner wall of the guide sleeve 23 and the outer wall of the top material shaft 18, the end of the top material shaft 18 extends out of the mounting cylinder 17 and is provided with a top cone 25, the peripheral wall of the top cone 25 is conical, used for being topped into the end hole of the end of the unwinding roller 8, the two top cones can ensure clamping the unwinding roller, the outer wall of the lower rotating sleeve 20 on the left top cone assembly 15 is provided with a pulley groove, which is in transmission connection with the second belt 14, the upper sliding sleeve 19 on the left top cone assembly 15 is connected with the piston rod of the air cylinder 26, the air cylinder 26 drives the upper sliding sleeve 19 to drive the top material shaft 18 to extend out, so that the top cone 25 on the top material shaft 18 clamps the unwinding roller 8, the upper sliding sleeve 19 on the right top cone assembly 16 is threadedly connected with a screw rod 27, the screw rod 27 is rotatably mounted on the mounting cylinder 17, the rotation of the screw rod 27 is driven by a hand wheel 28 (after the rotation of the hand wheel, the belt transmission between the shaft of the hand wheel and the screw rod), so that the axial position of the unwinding roller can be adjusted, so as to adapt to different specifications of the material roll.
[0016] The positioning bearing 6 is four, and is arranged symmetrically in pairs up and down and left and right at the edge of the limiting hole 5. In this way, the positioning of the disc in rotation can be ensured, so that the error after the rotation of the unwinding roller is small, and the offset after returning to the unwinding position is small.
[0017] After the above technical scheme is adopted, the following technical effects can be achieved: the symmetrical structure of the double discs cooperates with the positioning bearing to limit, disperses the single-point pressure of the weight of the material roll on the central shaft, significantly reduces the rotation error and the offset; the disc overturning function driven by the speed reducer realizes quick roll changing, and improves the position accuracy of the winding roller after roll changing (so that the position of the winding roller after roll changing does not change); the double top cone clamping (driven by the air cylinder) and axial adjustment (adjusted by the hand wheel) functions of the top mechanism not only ensure the stable clamping of the unwinding roller, but also ensure the conveying accuracy of the printed matter through the axial position adjustment, effectively solve the overprint deviation problem in high-speed printing, and improve the printing quality and production efficiency.
Claims
1. A disc unwinding member of a printing machine, characterized by comprising: The utility model provides a kind of material lifting and unwinding device, including two symmetrically arranged side plates (1), two side plates (1) are installed with turnover assembly and material lifting unwinding drive assembly;The turnover assembly includes the first support (2) installed in one side plate (1), the rotatable central shaft (3) is installed on the first support (2), the both ends of the central shaft (3) are symmetrically installed with the disc (4) corresponding to two side plates (1), the limiting hole (5) is arranged on the side plate (1) and is adapted to disc (4), disc (4) rotates in limiting hole (5), positioning bearing (6) is installed on the side plate (1) and is arranged along the edge of limiting hole (5), the positioning bearing (6) is symmetrically arranged, part of positioning bearing (6) is inserted into limiting hole (5) and is in contact with the outer wall of disc (4);The rotation of the central shaft (3) is driven by speed reducer (7);Disc (4) is provided with unwinding roller (8) symmetrically along central shaft (3), and the unwinding roller (8) is fixed and driven by material lifting unwinding drive assembly;The material lifting unwinding drive assembly includes the second support (9) fixed on the other side plate (1), the drive motor (10) corresponding to unwinding roller (8) and shaft tube (11) are installed on the second support (9), transmission shaft (12) and transmission coil (121) are installed in the shaft tube (11), transmission shaft is connected with transmission coil (121) by bearing sleeve, one drive motor is driven by transmission shaft (12) by first belt, another drive motor is driven by transmission coil (121) by another first belt, the other end of transmission shaft (12) and transmission coil (121) is respectively driven by second belt (14) and is connected with corresponding unwinding roller;Second belt (14) is driven by material lifting mechanism and unwinding roller (8).
2. The disc unwinding assembly of a printing press according to claim 1, characterized in that, The top mechanism comprises a left top cone assembly (15) and a right top cone assembly (16), the left top cone assembly (15) and the right top cone assembly (16) each comprises a mounting cylinder (17) mounted on the side plate (1), a top shaft (18), an upper sliding sleeve (19) and a lower rotating sleeve (20) are arranged in the mounting cylinder (17), one end of the top shaft (18) is mounted on the upper sliding sleeve (19) through a first bearing (21), the lower rotating sleeve (20) is connected with the inner wall of the mounting cylinder (17) through a second bearing (22), the inner wall of the lower rotating sleeve (20) is provided with a guide sleeve (23), an axial groove and convex strip guide cooperation structure (24) is arranged between the inner wall of the guide sleeve (23) and the outer wall of the top shaft (18), the end of the top shaft (18) extends out of the mounting cylinder (17) and is provided with a top cone (25), the outer wall of the lower rotating sleeve (20) on the left top cone assembly (15) is provided with a belt pulley groove, the belt pulley groove is in transmission connection with the second belt (14), the upper sliding sleeve (19) on the left top cone assembly (15) is connected with the piston rod of a cylinder (26), the cylinder (26) drives the upper sliding sleeve (19) to drive the top shaft (18) to extend, so that the top cone (25) on the top shaft (18) clamps the unwinding roller (8), the upper sliding sleeve (19) on the right top cone assembly (16) is screw-connected with a screw rod (27), the screw rod (27) is rotatably mounted on the mounting cylinder (17), and the rotation of the screw rod (27) is driven by a hand wheel (28).
3. The disc unwinding assembly of a printing press according to claim 1, characterized in that, The positioning bearing (6) is four, and is symmetrically arranged on the edge of the limiting hole (5) up and down and left and right.